Carburetor device



y 8, 937. B. MOLLBERG 2,080,668

CARBURETOR DEVICE Filed May 20. 1956 f @WLQJ Ra? ##orngy Patented May 18, 1937 UNITED STATES oAnBUnE'roR. DEVICE Byron Mollberg, St. Louis, Mo., assignor to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Delaware Application May 20, 1936, Serial No.- 80,739

4 Claims.

This invention relates to fluid pressure systems and consists particularly in novel means for assembling a piston rod with its actuating struc-,

ture.

In a well known type of automotive carburetor, the accelerating pump piston is actuated from a throttle lever, located substantially beneath the level of the pump cylinder, by means of linkage which extends upwardly along the cylinder and is connected to the upper portion of the pump piston. The piston is slidably mounted on the piston rod, and a spring is compressed between the piston and a portion of the actuating linkage connected to the piston rod for efiecting delayed action of the piston when the throttle is opened. Some difliculty has been experienced in providing a simple connection between the piston rod and linkage which may be easily assembled and disassembled and functions properly at all times.

An object of the present invention is to provide novel means for assembling a pump piston rod of the above type with its actuating linkage.

Another object is to provide novel, simplified means for facilitating hand assembly, without the use of tools, of the piston rod with its actuating linkage.

These objects and other more detailed objects hereafter appearing are obtained substantially by the structure illustrated in the accompanying drawing, in which:

Figure 1 is a side view of a carburetor embodying the invention, portions being broken away and sectioned for clearer illustration.

Figure 2 is a view taken at 90 degrees to Figure 1, portions being sectioned.

Figure 3 is an enlarged, diassembled view of a portion of the carburetor in Figures 1 and 2.

The carburetor illustrated is of a well known type including a vertical barrel l forming a downdraft mixture 'passage, and a fuel bowl 2. A throttle valve (not shown) is pivotally mounted in the lower portion of the mixture passage upon a shaft 3. A lever (not shown) is mounted on the righthand end of shaft 3 (Figure 1)- for manual operation of the throttle valve.-

Formed within the fuel bowl 2 is a cylinder 4 enclosing an accelerating pump piston 5 having a. central, longitudinal aperture 6 slidably receiving a valve member I carrying a needle valve 8 at its lower extremity. Lowering of piston 5 creates fluid pressure within the cylinder beneath the piston, raising valve carrier I and forcing Iuel through passages 9, l and II, and an accelerating nozzle (not shown) communicat- ..ing with passage H and discharging into the mixture passage in a well known manner.

The upper wall l2 of piston has a recess slidably receiving piston rod l3 having an offset or enlargement M at its lower end for seating against wall l2, and a slot l5 at its upper end receiving a finger l6 projecting from an inverted L-shaped member H. Member I! is slidably received within a vertical casing l8 extending through the fuel bowl and is connected at its lower extremity by a link IS with a crank 20 rigid with throttle shaft 3.

Compressed between and seated directly against finger I6 and piston 5 is a coiled spring 2| through which rod l3 extends. This lost motion, spring connection between the piston 5 and its actuating member I 1 provides for delayed action of the pump piston.

Pistonrod I3 is assembled with the piston by inserting the slotted end of the rod from the bottom of the piston through the apertured upper wall I2. Spring 2| is then applied and compressedto permit the insertion of finger l6 through slot IS. The spring, when released, seats against finger l6 and resists withdrawal of the finger from the slot, the finger having an overturned or hooked extremity Ilia for cooperating with the spring to prevent disassembly. Spring 2| also prevents rattling of the connected parts. In addition to serving as a connection between link l3 and actuating member II, the finger l6 also functions as seating abutment for the piston spring 2|.

The piston, piston rod, spring, and actuating member, as described, may be easily assembled or disassembled by hand, and the assembly will be properly maintained indefinitely. Finger l6 constitutes a complete seat for spring 2|, no collar or washer being necessary, and there are no keys, pins, or loose projecting elements to complicate assembly or conflict with adjacent parts. The number of parts is reduced to a minimum, resulting in economy and facility in manufacture, inspection, and repair.

The invention, may be advantageously utilized in connection with a carburetor accelerating pump as described, but, obviously, is not limited to this application, and various features thereof may be utilized in other fluid pressure systems, whether the piston supplies force to the fluid, as in case of a pump, or converts fluid pressure to other forms, as in' case of a motor. These modifications and others as will occur to those skilled in the art may be made in the illustrated structure without departing from the spirit of the invention and the exclusive use of all such modifications as come within the scope of the appended claims is contemplated.

I claim:

1. In combination, a piston rod having a recess, a piston actuating member having a part inserted in said recess, and a spring directly engaging said part for resisting movement thereof, said part having an offset for hooking over said spring whereby said part functions as a seat for said spring and cooperates with said spring to maintain the assembly.

2. In combination, a piston, a piston rod having a lost motion connection with said piston and having a recess spaced from said piston, a piston actuating member having a part inserted in said recess, and a spring extending between said piston and said part for resisting relative movement of said rod and said part and for maintaining the assembly between said rod and said actuating member.

3. Structure as specified in claim 2 in which said part is directly engaged by said spring and functions as a complete seating abutment therefor.

4. In combination, a piston rod having a recess, a piston actuating member having a part inserted ,in said recess, and a spring applied to said part for resisting rattling between the same and said piston rod, said part being hooked over said spring so as to form a seat therefor and cooperate with said spring to resist disassembly of said piston rod and said member.

BYRON MOLLBERG. 

